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Re: optimization/7799: [3.2/3.3 regression] Loop bug with optimization flag -Os in gcc

From: Eric Botcazou <ebotcazou at libertysurf dot fr>
To: "Christian Ehrhardt" <ehrhardt at mathematik dot uni-ulm dot de>
Cc: nejataydin at superonline dot com,gcc-gnats at gcc dot gnu dot org,gcc at gcc dot gnu dot org,gcc-bugs at gcc dot gnu dot org,nobody at gcc dot gnu dot org
Date: Fri, 13 Dec 2002 18:51:12 +0100
Subject: Re: optimization/7799: [3.2/3.3 regression] Loop bug with optimization flag -Os in gcc
References: <20021213133626.29733.qmail@theseus.mathematik.uni-ulm.de> <200212131449.01528.ebotcazou@libertysurf.fr> <20021213145249.20337.qmail@thales.mathematik.uni-ulm.de>

> Thanks for the clarification. This means that we can close the report?

'Suspended' is probably better.

> I can confirm that using -fno-strength-reduce fixes the problem.

The culprit is actually not the strength reduction pass per se, but the 
induction variable elimination pass that is bundled with it.

-- 
Eric Botcazou

References:
- Re: optimization/7799: [3.2/3.3 regression] Loop bug with optimization flag -Os in gcc
  - From: Christian Ehrhardt
- Re: optimization/7799: [3.2/3.3 regression] Loop bug with optimization flag -Os in gcc
  - From: Eric Botcazou
- Re: optimization/7799: [3.2/3.3 regression] Loop bug with optimization flag -Os in gcc
  - From: Christian Ehrhardt

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